xref: /freebsd/lib/libc/locale/mbsnrtowcs.c (revision 66fd12cf4896eb08ad8e7a2627537f84ead84dd3)
1 /*-
2  * SPDX-License-Identifier: BSD-2-Clause
3  *
4  * Copyright 2013 Garrett D'Amore <garrett@damore.org>
5  * Copyright 2010 Nexenta Systems, Inc.  All rights reserved.
6  * Copyright (c) 2002-2004 Tim J. Robbins.
7  *
8  * Copyright (c) 2011 The FreeBSD Foundation
9  *
10  * Portions of this software were developed by David Chisnall
11  * under sponsorship from the FreeBSD Foundation.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32  * SUCH DAMAGE.
33  */
34 
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
37 
38 #include <errno.h>
39 #include <limits.h>
40 #include <stdlib.h>
41 #include <wchar.h>
42 #include "mblocal.h"
43 
44 size_t
45 mbsnrtowcs_l(wchar_t * __restrict dst, const char ** __restrict src,
46     size_t nms, size_t len, mbstate_t * __restrict ps, locale_t locale)
47 {
48 	FIX_LOCALE(locale);
49 	if (ps == NULL)
50 		ps = &(XLOCALE_CTYPE(locale)->mbsnrtowcs);
51 	return (XLOCALE_CTYPE(locale)->__mbsnrtowcs(dst, src, nms, len, ps));
52 }
53 size_t
54 mbsnrtowcs(wchar_t * __restrict dst, const char ** __restrict src,
55     size_t nms, size_t len, mbstate_t * __restrict ps)
56 {
57 	return mbsnrtowcs_l(dst, src, nms, len, ps, __get_locale());
58 }
59 
60 size_t
61 __mbsnrtowcs_std(wchar_t * __restrict dst, const char ** __restrict src,
62     size_t nms, size_t len, mbstate_t * __restrict ps,
63     mbrtowc_pfn_t pmbrtowc)
64 {
65 	const char *s;
66 	size_t nchr;
67 	wchar_t wc;
68 	size_t nb;
69 
70 	s = *src;
71 	nchr = 0;
72 
73 	if (dst == NULL) {
74 		for (;;) {
75 			if ((nb = pmbrtowc(&wc, s, nms, ps)) == (size_t)-1)
76 				/* Invalid sequence - mbrtowc() sets errno. */
77 				return ((size_t)-1);
78 			else if (nb == 0 || nb == (size_t)-2)
79 				return (nchr);
80 			s += nb;
81 			nms -= nb;
82 			nchr++;
83 		}
84 		/*NOTREACHED*/
85 	}
86 
87 	while (len-- > 0) {
88 		if ((nb = pmbrtowc(dst, s, nms, ps)) == (size_t)-1) {
89 			*src = s;
90 			return ((size_t)-1);
91 		} else if (nb == (size_t)-2) {
92 			*src = s + nms;
93 			return (nchr);
94 		} else if (nb == 0) {
95 			*src = NULL;
96 			return (nchr);
97 		}
98 		s += nb;
99 		nms -= nb;
100 		nchr++;
101 		dst++;
102 	}
103 	*src = s;
104 	return (nchr);
105 }
106